This script will install everything needed to stream your PiCam over the network with very little CPU usage

raspi_preparestream.sh

#!/bin/bash

apt-get update
apt-get install -y git cmake autoconf bc libvpx-dev libx264-dev libjpeg-dev build-essential libtool autoconf ffmpeg #raspberrypi-kernel-headers

wget http://www.live555.com/liveMedia/public/live555-latest.tar.gz -O - | tar xvzf -
cd live
./genMakefiles linux
sudo make CPPFLAGS=-DALLOW_RTSP_SERVER_PORT_REUSE=1 install

cd /root/
git clone https://github.com/mpromonet/v4l2rtspserver.git
cd v4l2rtspserver
cmake . && make
make install

echo '#!/bin/bash' > /root/stream.sh
echo "modprobe -v bcm2835-v4l2" >> /root/stream.sh
echo "cd /root/v4l2rtspserver" >> /root/stream.sh
echo "./v4l2rtspserver" >> /root/stream.sh

cd /root
chmod +x stream.sh